blackbird307
Member
I have a controller that gets turned on by the push of a momentary push button with one set of contacts, and remains on using a single SPDT non latching relay. Pressing the button again starts a sequence in the controller. After the sequence is complete the plc shuts itself off by de-energizing the relay. I am expected to make a control schematic to make this work.
I spent a few hours on this, and im stumped. I can't figure it out. The only way I can see this working is using two relays and a momentary push button with two sets of contacts. One normally open relay would be activated using one of the contacts of the push button, and would maintain itself to allow power to the controller, the other relay would have normally closed contacts which get opened when the controller completes its sequence. The other set of contacts on the push button would solely be dedicated to an input of the controller to start sequence up pressing.
Is it possible to accomplish this with using just a single SPDT relay and a momentary pushbutton with one set of contacts??? To me this seems impossible.
Controller has 4 outputs, 3 dedicated to something else. And 1 dedicated to shutting itself off. The relay is an LY1
I spent a few hours on this, and im stumped. I can't figure it out. The only way I can see this working is using two relays and a momentary push button with two sets of contacts. One normally open relay would be activated using one of the contacts of the push button, and would maintain itself to allow power to the controller, the other relay would have normally closed contacts which get opened when the controller completes its sequence. The other set of contacts on the push button would solely be dedicated to an input of the controller to start sequence up pressing.
Is it possible to accomplish this with using just a single SPDT relay and a momentary pushbutton with one set of contacts??? To me this seems impossible.
Controller has 4 outputs, 3 dedicated to something else. And 1 dedicated to shutting itself off. The relay is an LY1
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